<!DOCTYPE html>
<meta name="timeout" content="long">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/dispatcher/dispatcher.js"></script>
<script src="/common/utils.js"></script>
<script src="../resources/utils.js"></script>
<script src="resources/utils.sub.js"></script>

<meta name="variant" content="?cross-site">
<meta name="variant" content="?same-site">

<script>
  setup(() => assertSpeculationRulesIsSupported());

  // In https://html.spec.whatwg.org/multipage/browsing-the-web.html#navigate,
  // `sourceDocument` (instead of `navigable`'s active document) should be
  // used as the referring document for prefetch.
  //
  // Nonetheless, a prefetch in a top-level window is not suitable to use in an iframe.
  // In particular, browsers partition storage and cache by top-level site.
  // If a browser does start allowing these in narrower cases where the partition
  // would nonetheless be the same, this test might need tweaking.
  promise_test(async t => {
    const win = await spawnWindow(t, { protocol: 'https' });

    const hostname =
      location.search === '?cross-site' ? '{{hosts[alt][www]}}' : undefined;
    const nextUrl = win.getExecutorURL({ protocol: 'https', hostname, page: 2 });

    await win.forceSinglePrefetch(nextUrl);

    // In https://html.spec.whatwg.org/multipage/browsing-the-web.html#navigate,
    // `sourceDocument` is the incumbent Document and thus `win`'s Document.
    // `navigable`'s active document is `iframe`'s Document.
    await win.execute_script((url) => {
      window.executor.suspend(() => {
        const iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        iframe.contentWindow.location.href = url;
      });
    }, [nextUrl]);

    // Below, the scripts given to `win.execute_script()` are executed on the
    // `nextUrl` page in the iframe, because `window.executor.suspend()` above
    // made `win`'s original page stop processing `execute_script()`,
    // while the new page of `nextUrl` in the iframe starts processing
    // `execute_script()` for the same ID.
    assert_equals(
        await win.execute_script(() => location.href),
        nextUrl.toString(),
        "expected navigation to reach destination URL");

    assert_not_prefetched(await win.getRequestHeaders());
  }, `location.href across iframe`);
</script>
